GB/T 21956.1-2008
农林窄轮距轮式拖拉机防护装置强度试验方法和验收条件.第1部分:前置式静态试验方法
The strength testing method and accepting condition of protective structures on narrow-track wheeled agricultural and forestry tractors-Part 1:Static testing method of front mounted ROPS
GBT21956.1-2008, GB21956.1-2008